(The Telegraph) Dysfunctional cartoon fathers Homer Simpson and Peter Griffin will be united in a special episode of The Simpsons in September, and if this sneak preview is anything to go by, it's likely to end in disaster and possibly the end of Springfield.

The Griffin family, known for starring in Seth MacFarlane's Family Guy, descend on Springfield for a single, eventful episode. Bart initiates Stewie in the art of pranking bartender Moe Szyslak and Peter and Homer bond over doughnuts before relationships really unravel.

The clip was first shown at Comic-Con in San Diego on Sunday before being posted to YouTube.

It is one of two hybrid Simpsons episodes that will appear later this year, the second being a mash-up with Matt Groening's other animated series, Futurama.